To make a new Marking, without overwriting the files, is this.
Go to your Feral heart folder, and fine the markings.cfg file and open it with Notepad. Scroll to the bottom of either the Feline body, tail, or head or Canine body, tail, or head.
Type in the name of the marking you wish to make,
Example:
Siamese;fmarkSiameseBody.png
Were you see the name Siamese is going to be the name of your marking. If the name has a space inbetween like Tiger Stripes, be sure to add that space for the first part of the code, and remove it for the second code.
That way it looks like this
Tiger Stripes;fmarkTigerStripesHead.png
After that place it at the bottom on each section you want.
Next is making the marking, take any of the marking from Ingame and use them as a guide. Remember erased parts on the file will be the marking. When your done, be sure to name it fmarkmarkingBody.png <---- marking is the name you called it in the code. Weather or not it's for the body head or tail is your choice, but you have to capitalize the Head Body or Tail or the code will not work.
When your all done, copy and paste your new marking into media/textures. Then you have to go Ingame to choose your marking, the marking will not show up in preset maker you have to login and go ingame inorder for it show up.
Be sure that your marking does not have white as the erased part, it has to be transparent.
Hope this helps.